mmc: meson-gx: drop of_match_ptr from of_device_id table

The driver can match only via the DT table so the table should be always
used and the of_match_ptr does not have any sense (this also allows ACPI
matching via PRP0001, even though it is not relevant here). This fixes
compile warning (!CONFIG_OF && !CONFIG_MODULES):

drivers/mmc/host/meson-gx-mmc.c:1252:34: warning:
‘meson_mmc_of_match’ defined but not used [-Wunused-const-variable=]

Reported-by: kernel test robot <[e-mail]>
Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Acked-by: Kevin Hilman <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/mmc/host/meson-gx-mmc.c

···
 	.driver		= {
 		.name = DRIVER_NAME,
 		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
-		.of_match_table = of_match_ptr(meson_mmc_of_match),
+		.of_match_table = meson_mmc_of_match,
 	},
 };